here are the measurements for my card, 10.5cm width x 21cm high. The Bell was cut at 3.75" width x 1.75" high. The ribbons will cut accordingly so don't worry about it.

NB Make sure u tap on the little yellow link symbol between the Width and Height wording. It should turn white. Once this happens then u can tap on the boxes with the numbers and change your width and height manually.

I just made sure I measured ribbon and bell before cutting so I would fit into the card size I had chosen.